Apparently the temporary closure is just to allow exhibits to be moved into the museum for the next big family exhibition, which may be something to do with this:
I need a coffee, I just read that as:
monkey wearing business suit
@promofaux - reading your comment nearly made me choke on my coffee with laughter.
It’s a big closure for presumably the access road and museum. I wonder if they’re taking the opportunity to do some other big jobs in the gardens that are easier without people around - tree maintenance etc.